/Engine/Source/Runtime/Engine/Classes/Animation/AttributeBlendOperator.h
Default blend operator used for any registered attribute type, when no user-defined operator has been specified UsingTEnableIfto select appropriate behaviour according to TAttributeTypeTraits::IsBlendable value for AttributeType template
template<typename AttributeType> class TAttributeBlendOperator : public [UE::Anim::IAttributeBlendOperator](API\Runtime\Engine\Animation\IAttributeBlendOperator)